The outer edges of the Milky Way's appear to be orbited by innumerable invisible galaxies, one of which appears to be crashing into our own. In 2005 astronomers discovered the first evidence of mysterious dark galaxies with no starlight - VirgoHI 21 - a mysterious cloud of hydrogen in the Virgo Cluster 50 million light-years from the Earth found to be colliding with our galaxy. Virgohi 21 revealed its existence from radio waves from neutral hydrogen coming from a rotating cloud containing enough hydrogen gas to spawn 100 million stars like the sun and fill a small galaxy.
Read More: http://www.dailygalaxy.com/my_weblog/2012/02/the-dark-galaxies-orbiting-the-milky-way.html
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